TextBox Validation in Delphi

[Keliaho0321]

Delphi validation program

Follow the instructions / procedures below:
1. Open your Delphi IDE
2. Create a Form with 2 TLabels, 2 TEdit and 1 TButton, Just like this:

3. Copy and paste the sourcecodes below:

unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
type
TForm1 = class(TForm)
Edit1: TEdit;
Label1: TLabel;
Edit2: TEdit;
Label2: TLabel;
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure Edit1KeyPress(Sender: TObject; var Key: Char);
procedure Edit2KeyPress(Sender: TObject; var Key: Char);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
Application.Terminate;
end;
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
if Key in ['0'..'9'] then Key := #0;
end;
procedure TForm1.Edit2KeyPress(Sender: TObject; var Key: Char);
begin
if Key in ['a'..'z'] + ['A'..'Z'] then Key := #0;
end;
end.

4. Take note and understand the functionality of the source codes:

5. Then Run your Program and input something for Names and Age. It will validate your inputs.

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